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Derivative financial liabilities - Additional Information (Details) £ in Thousands, $ in Thousands |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 15, 2022 GBP (£) | Jun. 15, 2022 USD ($) | Dec. 16, 2021 GBP (£) shares | Dec. 16, 2021 USD ($) shares | Jun. 30, 2022 GBP (£) | Jun. 30, 2021 GBP (£) | Jun. 30, 2022 USD ($) | Dec. 16, 2021 USD ($) shares
Disclosure of financial liabilities [line items] |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  | £ 25,000 |  |
Mudrick |  |  |  |  |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |  |  |  |  |
Increase through accumulating interest |  |  |  |  | £ 7,005 |  |  |
Mudrick | Convertible loan notes |  |  |  |  |  |  |  |
Disclosure of financial liabilities [line items] |  |  |  |  |  |  |  |
Principal amount |  |  | £ 151,000 |  |  |  |  | $ 200,000
Aggregate purchase price |  |  | £ 145,000 | $ 192,000 |  |  |  |
Convertible shares | shares |  |  | 18,181,820 | 18,181,820 |  |  |  |
Conversion ratio per $1000 principal amount | shares |  |  | 90.9091 |  |  |  |  | 90.9091
Denominator in calculation of number of equity instruments holder of convertible debt is entitled to, notional amount |  |  | £ 824 |  |  |  |  | $ 1,000
Interest rate |  |  |  |  | 9.00% |  | 9.00% |
Increase through accumulating interest | £ 7,005 | $ 8,950 |  |  |  |  |  |
Mandatory cash balance under loan covenants | $ |  |  |  |  |  |  | $ 10,000 |
Restricted cash |  |  |  |  | £ 8,235 |  |  |

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- Definition Decrease (increase) in derivative financial liabilities through interest + References No definition available. + Details
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- Definition Denominator in calculation of number of equity instruments that the holder of convertible debt is entitled to, in notional amounts. + References No definition available. + Details
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- Definition The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity. + References No definition available. + Details
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- Definition Mandatory cash balance under loan covenants + References No definition available. + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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